- May 17, 2003
Whats the jagged circle that can be seen between each arrow in the center of the stone? It is on every H&A. What facets cause this affect? Can it be gotten rid of?
On 7/11/2003 6:38:49 PM Cut Nut wrote:
Mara and RBJD black in an ideal-scope is not going to show light return (contrary to Rhino's education program and mistaken belief).
This black is the lack of illuination caused by the ever present observers head.
Would it be scintillation? I thought black meant scint spots? Or is it ALWAYS going to be the head? Even in an excellently cut stone?
Gary I do not disagree with this. You are correct with regards to these comments. In diffuse light conditions when you point the diamond at your face you'll see head on reflection (unless a light bulb is attached to your nose). Diffuse light complements contrast brilliance which is awesome in precision cut stones.----------------
On 7/11/2003 11:26:49 PM Cut Nut wrote:
The design of the FS IS LS etc is such that the lens area causes darkness in a diamond the exact same way a lens on a camera or a humans head does.
When you look at a H&A's diamond in soft lighting like a cloudy day you can see the same black star.
Black = no light.
Black provides contrast that makes adjacent brighter areas appear more brilliant - we call this scintillation as the black - white flashing occurs when the diamond is moved.
But black in a face on view is not scintillation and it is definetely not brightness.
When you look at a diamond there are 1 possible cause of darkness - you are seeing a light source that is very dim or non existant.
2 types are 1. light that has come from behind the diamond = leakage = white or pale in Ideal-scope etc
2. darkness from the environment above the girdle. In this case the only source of darkness is the lens.
The IS has an effective 6inch head at 14 inches viewing distance.
The Firescope has the same but very close up (about 10 inches).
Jonathon has never told anyone the proportions of his device.
Does that make my earlier post comprehensable? ----------------
On 7/12/2003 1:24:57 AM Cut Nut wrote:
All very nice, but my original point was you can not see this stuff - features, not benefits!!
RvE he he he----------------